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Flat beryllium tiles brazed to actively cooled CuCrZr withstand power densities up to 17 MW/m2. Tiles with 2 mm thickness have been cycled for 1000 pulses at power densities between 12 and 14 MW/m2. Flat CFC tiles brazed to OFHC copper failed at power densities of 13 MW/m2 with long (10 s) pulses. The fault developed from an area which showed signs of overheating from the start of the test and led to a complete detachment of one tile. For shorter pulse duration (2.5 s) higher power densities (17 MW/m2) could be applied. CFC cubes brazed around a central cooling pipe (monoblocks) have been tested to 15 MW/m2. The power density was limited by the peak surface temperature of the tiles, which exceeded 1500 - 2000 C. None of the tiles failed during the test, but there were considerable temperature variations from tile to tile.

Additional information

Authors: FALTER H D, JET Joint Undertaking, Abingdon, Oxon. (GB);CIRIC D, JET Joint Undertaking, Abingdon, Oxon. (GB);MASSMANN P, JET Joint Undertaking, Abingdon, Oxon. (GB);CARDELLA A, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);AKIBA M, JAERI, Naka-gun, Ibaraki-ken (JP)
Bibliographic Reference: Report: JET-P(93)53 EN (1993) 11 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199311381 / Last updated on: 1994-11-28
Original language: en
Available languages: en